Mendeleev's Periodic Table > Tm - Thulium

Tm - Thulium

Thulium was discovered in erbium ore in 1879 by Per Cleve in Sweden. Thulium is the least abundant of the earth elements, and is about as rare as silver, gold, or cadmium. The pure metal has a bright, silvery lustre. It is reasonably stable in air, but the metal must be protected from moisture. The element is silvery-grey, soft, malleable, and ductile, and can be cut with a knife. It is a rare earth metal found in minerals such as monazite.

Atomic number	-	69		Density	g/mL	9	.33
Atomic weight	u	168	.9342	Melting point	K	1818
Bonding radius	A	1	.56	Boiling point	K	2220
Atomic radius	A	2	.42	Heat of vaporization	kJ/mol	191
Ionization Potential	V	6	.184	Heat of fusion	kJ/mol	16	.84
Electronegativity	-	1	.25	Specific heat	J/gK	0	.16
The oxide is a weak base.				Crystal are hexagonal.
Electron config. : [Xe] 4f¹³ 6s²

Isotopes of Tm (Thulium) :

MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	146 62 msec p,1.128 MeV Er-145 145.96693	147 0.559 sec EC/p,10.700 Er-147/Er-146 146.96092	147a 0.39 msec p,1.061 MeV Er-146 146.96092	148 0.7 sec EC,12.000 MeV Er-148 147.95727
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	149 0.9 sec EC/ECp,9.600 Er-149/Ho-148 148.95233	150 2.2 sec EC,11.100 MeV Er-150 149.94965	151 4.17 sec EC,7.400 MeV Er-151 150.94543	152 8.0 sec EC,8.600 MeV Er-152 151.94428
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	153 1.48 sec a/EC,5.248 Ho-149/Er-153 152.94202	154 8.1 sec a/EC,8.050 Ho-150/Er-154 153.94142	155 21.6 sec a/EC,5.580 Ho-151/Er-155 154.93919	156 83.8 sec a/EC,7.200 Ho-152/Er-156 155.93892
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	157 3.63 min EC,4.480 MeV Er-157 156.93675	158 3.98 min EC,6.600 MeV Er-158 157.93699	159 9.13 min EC,3.850 MeV Er-159 158.93481	160 9.4 min EC,5.600 MeV Er-160 159.93505
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	161 30.2 min EC,3.160 MeV Er-161 160.93339	162 21.70 min EC,4.810 MeV Er-162 161.93393	163 1.810 hr EC,2.439 MeV Er-163 162.93264	164 2.0 min EC,3.962 MeV Er-164 163.93345
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	165 30.06 hr EC,1.592 MeV Er-165 164.93243	166 7.70 hr EC,3.040 MeV Er-166 165.93355	167 9.25 da EC,1.007 MeV Er-167 166.93284	168 93.1 da B-/EC,1.679 Yb-168/Er-168 167.93417
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	169 100% Stable 168.93421	170 128.6 da B-/EC,3.990 Yb-170/Er-170 169.93579	171 1.92 yr B-,1.490 MeV Yb-171 170.93642	172 63.6 hr B-,1.880 MeV Yb-172 171.93839
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	173 8.24 hr B-,1.298 MeV Yb-173 172.93960	174 5.4 min B-,3.080 MeV Yb-174 173.94216	175 15.2 min B-,2.390 MeV Yb-175 174.94383	176 1.9 min B-,3.880 MeV Yb-176 175.94673
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	177 85 sec B-,3.200 MeV Yb-177 176.94868

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